Nine degree cin/cout time-consuming reason

Tag: cin cout Timeout

When doing the nine-degree problem, due to the large amount of data, in many cases you have to use scanf and printf instead of CIN and cout for input and output, or it will be an error timeout can not AC.

There are three recommendations for increasing the input and output speed of C + +:

1. At the first line in main Function,add:std::ios_base::sync_with_stdio (false). Which cancel the Synchronization between <iostream> <cstdio>;
2. At the second line in main Function,add:std::cin.tie (0). Which leads to, CIN ties nothing.cin ties cout at first.
3. For all Endl, use ' \ n ' or ' \ n ' instead.

#include <algorithm>  #include <cstring>  using namespace std;  int main ()  {      Std::ios::sync_with_stdio (false);      Cin.tie (0);      int n,m;      cin>>n>>m;      cout<<n<< "" <<m<< "\ n";      return 0;  }  

Nine degree cin/cout time-consuming reason